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TIL that a blank TV screen received good audience ratings. During a strike by ITV workers in 1979, the UK network aired a caption stating "Transmissions will start again as soon as possible". One million TVs stayed tuned to ITV, as people hoped the strike would end soon. It ended after 11 weeks.

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8aOka TIL when in the 80s cheaper brands were lowering Intel's market share, the brand didn't know how to convince users to buy Intel-based PCs. But one retailer told them it would be enough to just tell people computers had Intel chips - and their idea, "Intel Inside" campaign, was a big sales success.
6WYZ TIL reindeer eyes switch from gold in summer to deep blue in winter
NXdAJ TIL of the discovery of chemotherapy. During WWII it was discovered that mustard gas reduced white blood cell counts. In the 1940s, two pharmacologists examined the effects of mustard gas in treating lymphoma in mice. They then treated a patient with nonHodgkin's lymphoma with the chemical agent.
w1Ao TIL the official size of the home plate in baseball is mathematically impossible to create in reality because it requires a right triangle of a size that does not exist.
R5ZOj TIL a 1979 study from Kays Kaidbey and his colleagues found that on average 55% of ultraviolet A rays penetrate Caucasian skin while fewer than 18% get through African-American skin. This is why photoageing is delayed in people with dark skin...